Queen's Necklace looks a bit like a children's game (mostly due to the included necklace) but the gameplay is actually more suited to adult gamers. It is a nice set-collection game where the value of your sets are highly dependent on the actions of the other players. This makes for a very unpredictable and highly psychological game - great for fans of bluffing/second guessing.
This is one of those rare games that works really well with 2 or 3 players. You have the feel that you're in terrible trouble yourself, not realising that the other player(s) feels just as bad. So you just need to take a few calculated gambles and chances are you'll win.